netdev - Re: [PATCH] ptp: Add PTP_CLOCK_EXTTSUSR internal ptp

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Message-ID: <20210630000933.GA21533@hoboy.vegasvil.org>
Date:   Tue, 29 Jun 2021 17:09:33 -0700
From:   Richard Cochran <richardcochran@...il.com>
To:     Jonathan Lemon <jonathan.lemon@...il.com>
Cc:     netdev@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH] ptp: Add PTP_CLOCK_EXTTSUSR internal ptp_event

On Mon, Jun 28, 2021 at 05:19:28PM -0700, Jonathan Lemon wrote:
> This fits in nicely with the extts event model.  I really
> don't want to have to re-invent another ptp_chardev device
> that does the same thing - nor recreate a extended PTP.

If you have two clocks, then you should expose two PHC devices.

If you want to compare two PHC in hardware, then we can have a new
syscall for that, like clock_compare(clock_t a, clock_t b);

Thanks,
Richard